libs/tiff/libtiff/tif_dumpmode.c

   1 /*
   2  * Copyright (c) 1988-1997 Sam Leffler
   3  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and
   6  * its documentation for any purpose is hereby granted without fee, provided
   7  * that (i) the above copyright notices and this permission notice appear in
   8  * all copies of the software and related documentation, and (ii) the names of
   9  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  10  * publicity relating to the software without the specific, prior written
  11  * permission of Sam Leffler and Silicon Graphics.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 /*
  26  * TIFF Library.
  27  *
  28  * "Null" Compression Algorithm Support.
  29  */
  30 #include "tiffiop.h"
  31
  32 static int DumpFixupTags(TIFF *tif)
  33 {
  34     (void)tif;
  35     return (1);
  36 }
  37
  38 /*
  39  * Encode a hunk of pixels.
  40  */
  41 static int DumpModeEncode(TIFF *tif, uint8_t *pp, tmsize_t cc, uint16_t s)
  42 {
  43     (void)s;
  44     while (cc > 0)
  45     {
  46         tmsize_t n;
  47
  48         n = cc;
  49         if (tif->tif_rawcc + n > tif->tif_rawdatasize)
  50             n = tif->tif_rawdatasize - tif->tif_rawcc;
  51
  52         assert(n > 0);
  53
  54         /*
  55          * Avoid copy if client has setup raw
  56          * data buffer to avoid extra copy.
  57          */
  58         if (tif->tif_rawcp != pp)
  59             _TIFFmemcpy(tif->tif_rawcp, pp, n);
  60         tif->tif_rawcp += n;
  61         tif->tif_rawcc += n;
  62         pp += n;
  63         cc -= n;
  64         if (tif->tif_rawcc >= tif->tif_rawdatasize && !TIFFFlushData1(tif))
  65             return (0);
  66     }
  67     return (1);
  68 }
  69
  70 /*
  71  * Decode a hunk of pixels.
  72  */
  73 static int DumpModeDecode(TIFF *tif, uint8_t *buf, tmsize_t cc, uint16_t s)
  74 {
  75     static const char module[] = "DumpModeDecode";
  76     (void)s;
  77     if (tif->tif_rawcc < cc)
  78     {
  79         TIFFErrorExtR(tif, module,
  80                       "Not enough data for scanline %" PRIu32
  81                       ", expected a request for at most %" TIFF_SSIZE_FORMAT
  82                       " bytes, got a request for %" TIFF_SSIZE_FORMAT " bytes",
  83                       tif->tif_row, tif->tif_rawcc, cc);
  84         return (0);
  85     }
  86     /*
  87      * Avoid copy if client has setup raw
  88      * data buffer to avoid extra copy.
  89      */
  90     if (tif->tif_rawcp != buf)
  91         _TIFFmemcpy(buf, tif->tif_rawcp, cc);
  92     tif->tif_rawcp += cc;
  93     tif->tif_rawcc -= cc;
  94     return (1);
  95 }
  96
  97 /*
  98  * Seek forwards nrows in the current strip.
  99  */
 100 static int DumpModeSeek(TIFF *tif, uint32_t nrows)
 101 {
 102     tif->tif_rawcp += nrows * tif->tif_scanlinesize;
 103     tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
 104     return (1);
 105 }
 106
 107 /*
 108  * Initialize dump mode.
 109  */
 110 int TIFFInitDumpMode(TIFF *tif, int scheme)
 111 {
 112     (void)scheme;
 113     tif->tif_fixuptags = DumpFixupTags;
 114     tif->tif_decoderow = DumpModeDecode;
 115     tif->tif_decodestrip = DumpModeDecode;
 116     tif->tif_decodetile = DumpModeDecode;
 117     tif->tif_encoderow = DumpModeEncode;
 118     tif->tif_encodestrip = DumpModeEncode;
 119     tif->tif_encodetile = DumpModeEncode;
 120     tif->tif_seek = DumpModeSeek;
 121     return (1);
 122 }